Ever since our parents got married, you've been the most annoying step brother ever. Even though we're the same age, I've been put in charge while they go to work all summer. Of course I've spanked you plenty of times, but now it seems you need more strict discipline. Because I want to start babysitting soon, I decided you'll be the perfect brat to practice on. Your face is bright red as I tower over you, teasing that you're naked in front of me. I tease you for being so embarrassed, needing your stepsister to put you in a diaper to control your behavior. You never expected this to happen, did you? Of course, I don't want to get in trouble if you get diaper rash, so there is plenty of powder put all over your bottom. Now that you're diapered, maybe you'll be less of a terror and behave for the rest of the day.